1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e93887a2db681f9f7bfad9805fb63a5f162a94e158e26a5c32b962e8416020b. Chain 2 (Bitcoin): anchored in block 954062 (2026-06-17T07:39:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/475c84be-a896-49ef-be5c-35e80c2a6b00.json and https://artists.proofprofile.net/proofs/artist/475c84be-a896-49ef-be5c-35e80c2a6b00.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01d5ab051899704631a68e7a11299fc161596c40f268f8a53d458a13fcf21009. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USCGH1695426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x774cd5965257bf46fb1767cd48e7dffc22b181b63324363fbf86c860f1b642a5. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USCGH1695429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe596781a07d3e2e9b8002e14e0bf8400730cbe3c792acd9901bc74c83ecf257c. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USCGH1695433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0323af5848b56abe1ec72dc0bcb9a226df9e92fde12c8289c90642c044774db. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USCGH1695442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88c846f12a419983ffa3387a2eebeb5efe4f4f2c2d26c17008d7d75c14b048e1. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USCGH1695443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9a8f0cb25d6bba9be7a46e52402f885fc822ec31f5338ce65439a647197a62c. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USCGH1695444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc781540e16d1f35d52ed0b9f68ba0819de54d366b3042eacfa031326c5c3e08f. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USCGH1695445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5da385d0387a27735798c9f9d068aebce00cbcac398ccbe9084f01ff1ffafdb5. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USCGH1695446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8bedd174aa72f06fe0f357d9bc6076d67897cbd7ff446539a3a7534b22b089b. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USCGH1695447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb26d72e3e63c5c5dc06b803ef3589cb15cd0c2cfa72c53ddf6e9541063340377. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USHM21645306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29ab27de896205b6aa0809330f29c755f3a2fea5b54b9f66a75bd3778ab20131. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USDY41670302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf081770ae509e7bcb08d5ef2ca9c62ecf7ca6f8ad926b60100fbf07e9e7c06e5. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USL4Q2474581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a459229a66dbe321c47f33b23a2512b7f9677ea711ac8ffb21341a9b8efcb1a. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USL4Q2474582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c4bb4f6d021f629374a2a6c4a9941b9a03ec343d65df07e8853da53b8b1dd4c. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USL4Q2474583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x371d38e677b0680361446b3a514eab913cf26bd66fa5c85a0967568b27704776. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USL4Q2474584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fe7c2051cd0dd8ba03b010f1032c5c5292618445c11f786323111f153b3f9c2. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USL4Q2474585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe269f3aa9c1a2c9a94101b2e4e9568c823e7c6846b59b48d28fd29a0f5755803. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USL4Q2474586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56d846c745e770fad5ed839717b2195c14a0c17415c24f47c5e242c1ed09e401. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USL4Q2474587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x563613214533cb22942157d2cfac808276a42d7cf4cf1c95785c5011a4598bd7. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USL4Q2474588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4efdd9636098c84e91038c3e941bf90bcda26cf5fd2406dc10f8440283b3221. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USL4Q2474589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0058fae6f7f5ba67d8b0e2a4870644b9bf567fc1da053f7a622e666b4d5b205. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USDY42025903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa58017bc418571e52c5d5bfc8c635102e41f28b65c4163a9321aa9a82f081500. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GTA242400028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0099a6bf265f16504797df352748cede47cbd4edf91729f4c3d4957ae17344e7. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GTA242400029.